From 7c98d3e14bb68686acfdf67b6642a7012c7dd4da Mon Sep 17 00:00:00 2001 From: Jared Boone Date: Fri, 28 Aug 2015 12:48:05 -0700 Subject: [PATCH 57/68] Add W25Q80BV function to fast-read from device. --- firmware/common/w25q80bv.c | 22 ++++++++++++++++++++++ firmware/common/w25q80bv.h | 3 +++ 2 files changed, 25 insertions(+) --- a/firmware/common/w25q80bv.c +++ b/firmware/common/w25q80bv.c @@ -198,3 +198,25 @@ w25q80bv_page_program(drv, addr, len, data); } } + +void w25q80bv_read(uint32_t addr, uint32_t len, uint8_t* const data) +{ + uint32_t i; + + /* do nothing if we would overflow the flash */ + if ((len > W25Q80BV_NUM_BYTES) || (addr > W25Q80BV_NUM_BYTES) + || ((addr + len) > W25Q80BV_NUM_BYTES)) + return; + + w25q80bv_wait_while_busy(); + + gpio_clear(PORT_SSP0_SSEL, PIN_SSP0_SSEL); + ssp_transfer(SSP0_NUM, W25Q80BV_FAST_READ); + ssp_transfer(SSP0_NUM, (addr >> 16) & 0xFF); + ssp_transfer(SSP0_NUM, (addr >> 8) & 0xFF); + ssp_transfer(SSP0_NUM, (addr >> 0) & 0xFF); + ssp_transfer(SSP0_NUM, 0xFF); + for (i = 0; i < len; i++) + data[i] = ssp_transfer(SSP0_NUM, 0xFF); + gpio_set(PORT_SSP0_SSEL, PIN_SSP0_SSEL); +}